Ok, thanks for checking it,
now the results are here and need to be adapted for Brainstorm.
I "believe" that the label zero should be 1, you can correct it locally for your data and we will improve the code soon.
so, you need to add this code at line 434
elem(elem(:,5)==0,5) = 1;
this will correct your error.
@Francois we may need to come back to the previous version of "process_fem_mesh"?
and use "try-catch" with the different OS and version of tetgen?
and we should report this to iso2mesh as well.